linux-kernel - Re: [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in nova-core

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Message-ID: <20251007112603.GX3360665@nvidia.com>
Date: Tue, 7 Oct 2025 08:26:03 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Zhi Wang <zhiw@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>, Alistair Popple <apopple@...dia.com>,
	Surath Mitra <smitra@...dia.com>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Neo Jia <cjia@...dia.com>
Subject: Re: [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in
 nova-core

On Tue, Oct 07, 2025 at 06:51:47AM +0000, Zhi Wang wrote:

> > You'd have to be more specific, I didn't see really any mediation
> > stuff in the vfio driver to explain why the VF in the VM would act so
> > differently that it "couldn't work"
> 
> From the device vendor’s perspective, we have no support or use case for
> a bare-metal VF model, not now and not in the foreseeable future. 

Again be specific, exactly what mediation in vfio is missing.

> Even hypothetically, such support would not come from nova-core.ko,
> since that would defeat the purpose of maintaining a trimmed-down
> kernel module where minimizing the attack surface and preserving
> strict security boundaries are primary design goals.

Nonsense. If you moved stuff from vfio to noca-core it doesn't change
the "trimmed-down" nature one bit.

I'm strongly against adding that profiling stuff to vfio, and I'm not
hearing any reasons why nova is special and it must be done that way.

Jason